Focused sound waves aren’t just the domain of children fooling around with long-distance microphones. They’re also important in ultrasound machines, and in biomedical laboratories, for “acoustic actuators” using sound to sort cells.
Sound focusing has its limits, however – the diffraction limit, roughly one wavelength of the …

COMMENTS

My kind of research.

Where do I sign up. I will be more than happy to empty the cans to the proper level. I remove the tabs already, and since the research requires only Coke Classic, I won't need the Coke Zero cans my wife wants me to use.